Persulfate

The term persulfate refers to ions or compounds with more oxygen than normal sulfates.

These do not have sulfur in a different oxidation state; rather, they contain peroxide units, where two oxygens take the place of one in a normal sulfate; the oxygen atoms are in oxidation state −1.

The main forms are peroxomonosulfates and peroxodisulfates.

## Ions

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* Peroxomonosulfate (or Peroxymonosulfate) ion, SO52−
* Peroxodisulfate (or Peroxymonosulfate) ion, S2O82−

## Acids

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* Peroxymonosulfuric acid (persulfuric acid), H2SO5
* Peroxydisulfuric acid, H2S2O8

## Example salts

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* Sodium peroxomonosulfate, Na2SO5
* Potassium peroxymonosulfate, KHSO5
* Sodium peroxodisulfate, Na2S2O8